I would like to install a standpipe drainage from my washer to connect to kitchen drain pipe that is about 10 feet from the washer. The kitchen drain piping is the standard 1 1/2 inch pipes. The standpipe has to be 2 inches. Should I make the drain up to the sink 2 in piping or can I convert it to 1 1/2 near the washer. Also can I expect to have water not draining quickly enough through the kitchen drain.